noun

• (countable, clothing) An outer garment covering the upper torso and arms.
  "It was April 22, 1831, and a young man was walking down Whitehall in the direction of Parliament Street. He wore shepherd's plaid trousers and the swallow-tail coat of the day, with a figured muslin cravat wound about his wide-spread collar."
• (countable) A covering of material, such as paint.
  "fresh coat of paint"
• (countable) The fur or feathers covering an animal's skin.
  "Near-synonym: pelt"
• (uncountable, nautical) Canvas painted with thick tar and secured round a mast or bowsprit to prevent water running down the sides into the hold (now made of rubber or leather).

verb

• (transitive) To cover with a coating of some material.
  "The frying pan was coated with a layer of non-stick material, making it easier to wash."
• (transitive) To cover like a coat.
• (transitive, archaic) To clothe.